LINE OUTPUTS
Two balanced ¼ inch Tip, Ring, and Sleeve line outputs are
provided -
(11) and (12). The left operates as a mono output for
sub woofers and mono devices if nothing is plugged into the
right line output. When a ¼ inch plug is inserted into the right
output the line outputs operate in normal stereo mode. The
line outputs may be used simultaneously with the headphone
outputs and are both controlled with the master volume knob
(20). In the event of ground loops when connecting the mixer
line outputs to other devices that have an earth ground, it may
become necessary to lift the shield at the mixer outputs.
NEVER lift or disconnect the AC safety ground of any device.
AUX IN
The auxiliary input
(10) is a 1/8 inch Tip, Ring, and Sleeve input
optimized for +4 dBu input levels. These signals are summed
into the analog section of the mixer just upstream of the
master volume
(20). The input permits another stereo mix to be
inserted into the mixer. Examples of use would be a drum
machine click track into the drummers mixer. Another
application would be a stereo mix from a guitar or keyboard
local mix, another Hear Back Mixer, creating a total of ten
channels controlled from your mixer.
MASTER VOLUME
The master volume
(20) is used to set the volume of the
headphones and the line outputs. When using the line outputs
in conjunction with the headphones, optimize the mix for the
headphones and then adjust the device connected to the line
outputs to balance the gain. Follow the same procedure if
using the AUX input; once the desired mix is obtained, adjust
the source to get the desired level at the AUX input.
HEADPHONE AMPLIFIER
The headphone amplifier outputs
(21) and (23) are paralleled
outputs. When using multiple headsets, the total impedance
should not go below 16 ohms. The headphone amplifiers are
very powerful and can easily damage in-ear transducers,
headphones, and your hearing; exercise great care in
adjusting the master volume. At 50 ohms the amplifier is
capable of sustaining 2 watts of power! The amplifiers are
short circuit protected and have a fault indicator
(22).
HEAR BACK CONNECTING AND CALIBRATION
1. Connect the appropriate input(s), as shown in the hook-up
diagrams beginning on page 10, and select the desired
input using the front panel switch. Connect mixers to the
hub outputs using CAT5E cables and set all mixer controls
to off (full counter-clock-wise position, except the limiter
which should be fully clock-wise), connect the headphones,
in-ear monitors, and/or line outputs for connecting to
wireless in-ear systems, powered monitors, or other
devices requiring line-level inputs.
2. Turn on hub power.
3. Adjust the level at the input source (DAW, Mixer, etc.) until
the clip LED's on the hub just come on and then reduce the
input(s) until you have a bright blue LED. NOTE: Adjust the
source for as much signal into the hub as possible without
clipping. Higher input levels improve signal-to-noise and
dynamic range.
4. Mixer Adjustment: Once you have the signals optimized,
turn the master volume to about 10 o'clock and then raise
the stereo mix to a comfortable level normally around 10
o'clock. Adjust the "more me" mono/stereo inputs 3-8 to the
desired levels. Avoid adjusting the Master Volume too high
and running the inputs too low.
5. Limiter Adjustment: Once a mix is established, turn the
limiter threshold knob counter-clockwise until the blue LED
just comes on, then turn clockwise until the LED goes off.
This sets the limiter to protect your hearing and monitoring
device in the event an input goes above normal levels. The
limiter should only come on when this condition occurs.
Causing the limiter to operate (blue LED on) during normal
operation will cause a loss of dynamic range and will add
distortion to the signals being monitored. Remember, it is
for excessive signals only.
NOTE: The HearBus and mixer outputs contain high speed
digital audio and should be treated as a transmission line. Do
not "Y" these connections because the terminated controlled
impedance will be comprised. The HearBus and mixer outputs
operate at 12.28 MHz.
Now enjoy personal monitoring at its best and have fun!
11 12
10
20
20
21 23
22
!
WARNING
The Hear Back Mixer is capable of driving most
headphones to extreme levels that can damage your
HEARING!
ALWAYS turn down the mixer "Master Volume" down
before putting on in-ear headsets or headphones.
The mixer Limiter is pre-master volume and protects
from excessive input signals. It is the user's
responsibility to prevent hearing damage by virtue of
excessive headphone "Master Volume" settings.
20
1506
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